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Huang Rongfu; Shen Songdong and Lu Xuefeng(Northwest Plateau Institute of Biology, Academia Sinica, Xining 81001)  
The karyotypes of six endemic species of genus Pedicularis distributed in northeast Qinghai-Xizhan Plateau are analysed and repoted in this paper, and according to the karyotypes and theirs parameters, we have analysed and compared karyotypic asymmetry and its relative evolutive level for six species. The result shows that the 2n=16 is chromosome number of body cell for these six species. Their karyotype formulae (K)and chromosome component of relative length (C. RL) and the index of karyotypic asymmetry (As·K) are each presented as folows: Pedicularis pilostachya Maxim., K(2n)=16=4m+12sin, C. RL=2L+6M2+6M1+2S(Luo S. R., 1972), As·K=65.29% (Arano H., 1963 ), the karyotypic type belongs to ZA (Stebbins, 1971 ) ; P. przewalskii Maxim. , K (2n )=16=8m (SAT ) + 4sin + 2st+2t. C. RL=2L+8M2+2M1+4S, As·K= 65. 02%, the karyotypic type belongs to ZB; P. oederi Vahl. var. sinensis (Maxim. ) Hums., K(2n)= 16=12m+4sm, C. RL=2L+4M2+8M1+2S, As·k=59. 89%, bilongs to 1B; P. rudis Maxim., K (2n) =16+ 4m+ 10sm+2st, C. RL= 4L+4M2+6M1 +2S, As·K= 68. 10%, belongs to 2B; P. kansuensis Maxim. subsp. kansuensis, K (2n)= 16=6m+6sm+2t,C. RL=1L+ 6M2 +6M1 +2S, As·K= 68.92 %, bilongs to 2A; P. muscicola Maxim., K (2n)= 8m (SAT) +sin, C. RL= 2L+8M2+4M1 +2S, As·K= 62. 64%, bilongs to 2B. On the bases of karyotypes of six species and availeble data. we consider that the basic chromosome number of genus Pedicularis bave to be eigth (x=8). In a few species there is a polyploid. In conformity with the comprison of the karyotypes and asymmetry for above-mentioned six species, the evolutive level shown by karyotypic asymmetry have related with the evolution of corolla.
【Fund】: 中国科学院生物分类特别支持费资助
【CateGory Index】: Q949.777.8
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